[RTL UI] Bidi-wrap filenames, paths, urls, metadata

bidi.lua:
- Revert "Alias everything to Bidi.nowrap() when in LTR UI,
  as using LTR isolates seems uneeded when already LTR" (part
  of a628714f) which was a wrong assumption: we need proper
  wrappers for all things paths. Enhance some of these wrappers.
- Fix GetText RTL wrapping which was losing empty lines and
  trailing \n.

- Wrap all paths, directories, filenames in the code with
  these wrappers.
- Wrap all book metadata (title, authors...) with BD.auto(),
  as it helps fixing some edge cases (like open/close quotation
  marks which are not considered as bracket types by FriBiDi).
  (Needed some minor logic changes in CoverBrowser.)

- Tweak hyphenation menu text
- Update forgotten SortWidget for UI mirroring
- KoptConfig: update "justification" index for RTL re-ordering,
  following the recent addition of the page_gap_height option.

frontend/ui/network/manager.lua

@@ -1,3 +1,4 @@
+local BD = require("ui/bidi")
 local ConfirmBox = require("ui/widget/confirmbox")
 local DataStorage = require("datastorage")
 local Device = require("device")
@@ -225,7 +226,7 @@ function NetworkMgr:getProxyMenuTable()
     end
     return {
         text_func = function()
-            return T(_("HTTP proxy %1"), (proxy_enabled() and proxy() or ""))
+            return T(_("HTTP proxy %1"), (proxy_enabled() and BD.url(proxy()) or ""))
         end,
         checked_func = function() return proxy_enabled() end,
         callback = function()
@@ -388,7 +389,7 @@ function NetworkMgr:reconnectOrShowNetworkMenu(complete_callback)
                            complete_callback()
                        end
                        UIManager:show(InfoMessage:new{
-                           text = T(_("Connected to network %1"), network.ssid),
+                           text = T(_("Connected to network %1"), BD.wrap(network.ssid)),
                            timeout = 3,
                        })
                        return